Ambonosphaera calloviana

*calloviana Fensome, 1979, p.51-54, pl.7, figs.3,5-6,8-9; text-figs.16A-D,17A-B. Holotype: Fensome, 1979, pl.7, figs.3,6,9; text-figs.16B-C; Fensome et al., 1993a, figs.1-3,7-8 - p.1007. Originally (and now) Ambonosphaera, subsequently Polygonifera. Prauss (1989, p.31) retained this species in Ambonosphaera. Age: Early Callovian.